ProductProcessUrlRewriteSavingObserver.php

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<?php
namespace Magento\CatalogUrlRewrite\Observer;

use Magento\Catalog\Model\Product;
use Magento\CatalogUrlRewrite\Model\ProductUrlRewriteGenerator;
use Magento\UrlRewrite\Model\UrlPersistInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;
use Magento\Framework\Event\ObserverInterface;

class ProductProcessUrlRewriteSavingObserver implements ObserverInterface
{
    private $productUrlRewriteGenerator;

    private $urlPersist;

    public function __construct(
        ProductUrlRewriteGenerator $productUrlRewriteGenerator,
        UrlPersistInterface $urlPersist
    ) {
        $this->productUrlRewriteGenerator = $productUrlRewriteGenerator;
        $this->urlPersist = $urlPersist;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();

        if ($product->dataHasChangedFor('url_key')
            || $product->getIsChangedCategories()
            || $product->getIsChangedWebsites()
            || $product->dataHasChangedFor('visibility')
        ) {
            if ($product->isVisibleInSiteVisibility()) {
                $this->urlPersist->replace($this->productUrlRewriteGenerator->generate($product));
            }
        }
    }
}